Improvement in drawing-pens



E. DA-GUIN. P

7' Drawing-Pens. No.l57,58,4,. PatentedDec.8,l874.

Fig. 2. Fig. 5 W

Fig.1,

UNITED STATES PATENT OFFICE,

EUGENE DAGUIN, OF PARIS, FRANCE.

IMPROVEMENT IN DRAWING-PENS- Specification forming part of LettersPatent N0. 157,584, dated December 8, 1874; application filed January 9,1873.

To all whom it may concern:

Be it known that I, EUGENE DAGUIN, of Paris, in France, have inventedImprovements in Drawing-Pens, of which the following is a specification:V

The object of these improvements is to enable fine, thick, or taperedlines to be executed by the drawing-pen at one stroke, Without recourseto the setting-screws usually employed for varying the opening of thenibs.

Figure l of the accompanying drawing is a front View of. a compass-penconstructed according to this invention. Fig. 2 is acrosssection of thesame through line A B, Fig. 1. Fig. 3 isa front View of a pen fortracing straight lines.

at b are flattened portions of the branches a b, twisted in oppositedirections to each other,

.and inclined at an angle of from thirty to forty-five degrees to theplane passing by the axis of the pressure-screw, as indicated in Fig. 2.These flattened parts are sufficiently thin to bend or spring underslight pressure, thus causing the tracing-points to open more or less,like the slit nib of the common writing-pen, and to close againaccording as the pressure is removed. d is a screw, for adjusting theseparation of the branches to the maximum thickness of the lines to betraced, which, when required, may be tapered 01f to the finest point byvarying the pressure of the hand. 0 is the screw by which the points areset to the minimum thickness of line to be traced.

, For the execution of thick straight lines, the branch I) is fittedwith a rigid bar, f, Fig. 3, which, acting as guide against the rule g,allows the point of the pen to open freely to the required extent.

The pen above described may be converted into an ordinary drawing-pen byremoving the screw 0 and using the screw 01 for the adjustment of thepoints.

What I claim, and desire to protect by Letters Patent, is

An improved drawing-pen, constructed with a thin blade or spring, a 11,substantially as and for the purpose herein set forth and shown.

E. DAGUIN.

